Floating Bar Graphs

The FloatingBarGraph and HorizontalFloatingBarGraph
types of graph are useful for displaying ranges of data. The structure
value field specifies the first data point, and the second is
provided by the end field.

$settings['structure'] = array('key' => 0, 'value' => 1, 'end' => 3);

The default tooltip will display the difference between the end
and value values. The floating bar graphs support all the options
available for standard bar graphs, except for
bar labels.

Bubble Graph

Bubble graphs are similar to scatter graphs,
but show a filled circle instead of a marker. The X and Y position of the bubble
is given by the key and value, and the size of the
bubble is provided by the area field.

The size of the bubble is proportional to the Y scale of the graph, but this
means that the bubbles can appear too large or small. The
bubble_scale option can be used to increase or decrease the size of
all bubbles.

SVGGraph fills negative bubbles with a check pattern, as can be seen in the
“Me” entry in the example graph at the top of the page.

Box and Whisker Graph

The BoxAndWhiskerGraph displays statistical data, and I'll leave
it to the
Wikipedia page to provide a proper description.

Each box and its whiskers requires five pieces of data - the median is supplied
in the value field, the box top and bottom are in the top
and bottom fields, and the top and bottom whisker values are provided
in the wtop and wbottom fields.

Empty Graph

The EmptyGraph is a bit different to the other types - it draws
an empty graph. You can set the graph values, colours, links, legend entries,
but EmptyGraph will ignore them. This might seem useless, but you
can draw shapes and
custom labels on it, and you can also
set the graph background, title, edge and metadata.